Advances in Virus Research, Volume 103, the latest in the Advances in Virus Research series, contains new, informative updates on the topic. First published in 1953, this series covers a diverse range of in-depth reviews, providing a valuable overview of the current field of virology. Updates to this release include a Review on phage genes that affect bacterial phenotypes, Phage lysis: new perspectives on the bacterial cell envelope, CRISPRs as the adaptive immune system of archaea and bacteria, CRESS viruses, Tupanviruses, and Giant virus evolution, amongst other topics.